# GPT-5.4 Thinking System Card

DevFeed: [GPT-5.4 Thinking System Card](<https://devfeed.tech/articles/gpt-5-4-thinking-system-card-6424.md>)

Original publisher: [Read original article](<https://openai.com/index/gpt-5-4-thinking-system-card>)

Published: 2026-03-05T10:00:00Z

Content type: article

Language: en

Sources: [OpenAI News](<https://devfeed.tech/sources/openai-news.md>)

Topics: [Cybersecurity](<https://devfeed.tech/topics/cybersecurity.md>), [codex](<https://devfeed.tech/topics/codex.md>), [ChatGPT](<https://devfeed.tech/topics/chatgpt.md>), [API](<https://devfeed.tech/topics/api.md>)

Tags: [api](<https://devfeed.tech/tags/api.md>), [blog](<https://devfeed.tech/tags/blog.md>), [chatgpt](<https://devfeed.tech/tags/chatgpt.md>), [codex](<https://devfeed.tech/tags/codex.md>), [cybersecurity](<https://devfeed.tech/tags/cybersecurity.md>), [gpt](<https://devfeed.tech/tags/gpt.md>), [model](<https://devfeed.tech/tags/model.md>), [publication](<https://devfeed.tech/tags/publication.md>), [reasoning](<https://devfeed.tech/tags/reasoning.md>), [safety](<https://devfeed.tech/tags/safety.md>)

## AI overview

The GPT-5.4 Thinking System Card describes the model's reasoning-model status, safety mitigations, and cyber-safety approach. It states that GPT-5.4 Thinking is the first general-purpose model in the series with mitigations for High capability in Cybersecurity, building on approaches used for GPT-5.3 Codex in ChatGPT and the API.

## Source excerpt

GPT-5.4 Thinking is the latest reasoning model in the GPT-5 series, and explained in our blog. The comprehensive safety mitigation approach for this model is similar to previous models in this series, but 5.4 Thinking is the first general purpose model to have implemented mitigations for High capability in Cybersecurity. The approach to cyber safety builds on the latest approaches implemented for GPT-5.3 Codex, in ChatGPT and the API.